This document discusses vasospasm, a complication that can occur after subarachnoid hemorrhage from a ruptured cerebral aneurysm. Approximately 70% of patients will show angiographic evidence of vasospasm, and 30% will experience symptomatic vasospasm. The risk is highest between 4-9 days after hemorrhage. Vasospasm does not always lead to ischemia and brain injury, which depends on additional factors like microcirculatory failure. Management involves a 6 point plan: 1) nimodipine administration, 2) euvolemia, 3) induced hypertension, 4) magnesium supplementation, 5) cerebral angioplasty or intra-arterial vasodilators if needed, and 6